Reciprocating driving device

Abstract

A shock absorbed device for reciprocating a driven member includes a bidirectionally rotatable driving pulley, a pair of fixed pulleys between which the driven member is disposed, an oscillating pulley arranged between the driving and fixed pulleys, and at least a wire connecting all said pulleys. The oscillating pulley is mounted for free movement along a path from a neutral position centrally within its path in response to rotation of the driving pulley in either direction thereof.

I claim: 
     
       1. A driving device for reciprocating a driven member in a copying machine and for minimizing operative vibration as reciprocation of the driven member is initiated, said driving device comprising: a bidirectionally rotatable driving pulley;   at least two fixed pulleys mounted in spaced apart relation on the copying machine;   an oscillating pulley;   wire means guided about alternating radially opposite sides of said driving pulley, said oscillating pulley and said fixed pulleys, and connected to the driven member between said fixed pulleys;   an oscillating plate for supporting said oscillating pulley between said driving pulley and said fixed pulleys, said oscillating plate being substantially freely movable to carry said oscillating pulley along a path from a neutral position centrally within said path in response to rotation of said driving pulley in either direction thereof; and   a friction member for applying a frictional force to said freely movable oscillating plate in either direction of driving pulley rotation to damp movement of said oscillating plate as reciprocation of the driven member is initiated.   
     
     
       2. A driving device in accordance with claim 1, further comprising a tensile force adjustment device for adjusting the tensile force of said wire means. 
     
     
       3. A driving device in accordance with claim 1, further comprising a main pulley disposed between said oscillating pulley and said fixed pulleys. 
     
     
       4. A driving device in accordance with claim 2, said tensile force adjustment device including a fixture eccentrically pivotally mounted on said driving pulley and having an end of said wire means fixed thereto, and means for selectively fixing the pivotal position of said fixture with respect to said driving pulley so as to predeterminately adjust the tensile force of said wire means.